I've translated and summarised the interview, paraphrasing for brevity.

factum: You've been criticizing the theory of man-made global warming for years. How did you become skeptical?

Puls: Ten years ago I simply parroted what the IPCC told us. One day I
started checking the facts and data - first I started with a sense of
doubt but then I became outraged when I discovered that much of what the
IPCC and the media were telling us was sheer nonsense and was not even
supported by any scientific facts and measurements. To this day I still
feel shame that as a scientist I made presentations of their science
without first checking it. The CO2-climate hysteria in Germany is
propagated by people who are in it for lots of money, attention and
power.

factum: Is there really climate change?

Puls: Climate change is normal. There have always been phases of climate
warming, many that even far exceeded the extent we see today. But there
hasn't been any warming since 1998. In fact the IPCC suppliers of data
even show a slight cooling.

factum: The IPCC is projecting 0.2C warming per decade, i.e. 2 to 4C by the year 2100. What's your view?

Puls: These are speculative model projections, so-called scenarios - and
not prognoses. Because of climate's high complexity, reliable prognoses
just aren't possible. Nature does what it wants, and not what the
models prophesize. The entire CO2-debate is nonsense. Even if CO2 were
doubled, the temperature would rise only 1C. The remainder of the IPCC's
assumed warming is based purely on speculative amplification
mechanisms. Even though CO2 has risen, there has been no warming in 13
years.

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factum: How does sea level rise look?

Puls: Sea level rise has slowed down. Moreover, it has dropped a half
centimeter over the last 2 years. It's important to remember that mean
sea level is a calculated magnitude, and not a measured one. There are a
great number of factors that influence sea level, e.g. tectonic
processes, continental shifting, wind currents, passats, volcanoes.
Climate change is only one of ten factors.

factum: What have we measured at the North Sea?

Puls: In the last 400 years, sea level at the North Sea coast has risen
about 1.40 meters. That's about 35 centimeters per century. In the last
100 years, the North Sea has risen only 25 centimeters.

factum: Does the sea level rise have anything to do with the melting North Pole?

Puls: That's a misleading conclusion. Even if the entire North Pole
melted, there would be no sea level rise because of the principles of
buoyancy.

factum: Is the melting of the glaciers in the Alps caused by global warming?

Puls: There are many factors at play. As one climbs a mountain, the
temperature drops about 0.65C per 100 meters. Over the last 100 years it
has gotten about 0.75°C warmer and so the temperature boundary has
shifted up about 100 meters. But observations tell us that also ice 1000
meters up and higher has melted. Clearly there are other reasons for
this, namely soot and dust. But soot and dust do not only have
anthropogenic origins; they are also caused by nature via volcanoes,
dust storms and wildfires. Advancing and retreating of glaciers have
always taken place throughout the Earth's history. Glaciology studies
clearly show that glaciers over the last 10,0000 years were smaller on
average than today.

factum: In your view, melting Antarctic sea ice and the fracture of a huge iceberg 3 years ago are nothing to worry about?

Puls: To the contrary, the Antarctic ice cap has grown both in area and volume over the last 30 years, and temperature has declined. This
30-year trend is clear to see. The Amundsen Scott Station of the USA
shows that temperature has been declining there since 1957. 90% of the
Earth's ice is stored in Antarctica, which is one and half times larger
than Europe.

factum: Then why do we always read it is getting warmer down there?

Puls: Here they are only talking about the West Antarctic peninsula,
which is where the big chunk of ice broke off in 2008 - from the
Wilkins-Shelf. This area is hardly 1% of the entire area of Antarctica,
but it is exposed to Southern Hemisphere west wind drift and some of the
strongest storms on the planet.

factum: What causes such massive chunks of ice to break off?

Puls: There are lots of factors, among them the intensity of the west
wind fluctuations. These west winds have intensified over the last 20
years as part of natural ocean and atmospheric cycles, and so it has
gotten warmer on the west coast of the Antarctic peninsula. A second
factor are the larger waves associated with the stronger storms. The
waves are more powerful and so they break off more ice. All these causes
are meteorological and physical, and have nothing to do with a climate
catastrophe.

factum: Then such ice breaks had to have occurred in the past too?

Puls: This has been going on for thousands of years, also in the 1970s,
back when all the talk was about "global cooling". Back then there were
breaks with ice chunks hundreads of square kilometers in area. People
were even discussing the possibilities of towing these huge ice chunks
to dry countries like South Africa or Namibia in order to use them as a
drinking water supply.

factum: What about all the media photos of polar bears losing their ice?

Puls: That is one of the worst myths used for generating climate
hysteria. Polar bears don't eat ice, they eat seals. Polar bears go
hungry if we shoot their food supply of seals. The polar bear population
has increased with moderately rising temperatures, from 5000 50 years
ago to 25,000 today.

factum: But it is true that unlike Antarctica, the Arctic is melting?

Puls: It has been melting for 30 years. That also happened twice already
in the last 150 years. The low point was reached in 2007 and the ice
has since begun to recover. There have always been phases of Arctic
melting. Between 900 and 1300 Greenland was green on the edges and the
Vikings settled there.

factum: And what do you say about the alleged expanding deserts?

Puls: That doesn't exist. For example the Sahara is shrinking and has
lost in the north an area as large as Germany over the last 20 years.
The same is true in the South Sahara. The famine that struck
Somalia, Kenya and Ethiopia was mainly caused by the leasing of large
swathes of land to large international corporations so that they could
grow crops for biofuels for Europe, and by war. But it is much easier
for prosperous Europe to blame the world's political failures on a
fictional climate catastrophe instead.

factum: So we don't need to do anything against climate change?

Puls: There's nothing we can do to stop it. Scientifically it is
sheer absurdity to think we can get a nice climate by turning a CO2
adjustment knob. Many confuse environmental protection with climate
protection. it's impossible to protect the climate, but we can protect
the environment and our drinking water. On the debate concerning
alternative energies, which is sensible, it is often driven by the
irrational climate debate. One has nothing to do with the other.

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